Display screen or portion thereof with a graphical user interface



FIG. 1 is a display screen or portion thereof with a graphical userinterface;

FIG. 2 is an expanded view of the left-hand side of FIG. 1;

FIG. 3 is an expanded view of the right-hand side of FIG. 1;

FIG. 4 is a second embodiment of the display screen or portion thereofwith a graphical user interface.

FIG. 5 is an expanded view of the left-hand side of FIG. 4; and,

FIG. 6 is an expanded view of the right-hand side of FIG. 4.

The outermost broken line rectangle in FIG. 1 and FIG. 4 shows thedisplay screen, and forms no part of the claims design. The verticaldash-dot-dot line styles in FIGS. 2, 3, 5, and 6 denote sectional views.All other broken lines are features of the graphical user interface thatform no part of the claimed design.

CLAIM The ornamental design for a display screen or portion thereof witha graphical user interface, as shown and described.